13821994 has 4 divisors (see below), whose sum is σ = 20732994. Its totient is φ = 6910996.

The previous prime is 13821971. The next prime is 13822007. The reversal of 13821994 is 49912831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11309769 + 2512225 = 3363^2 + 1585^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3455497 + ... + 3455500.

Almost surely, 2^13821994 is an apocalyptic number.

13821994 is a deficient number, since it is larger than the sum of its proper divisors (6911000).

13821994 is an equidigital number, since it uses as much as digits as its factorization.

13821994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6910999.

The product of its digits is 15552, while the sum is 37.

The square root of 13821994 is about 3717.7942385237. The cubic root of 13821994 is about 239.9883906421.

The spelling of 13821994 in words is "thirteen million, eight hundred twenty-one thousand, nine hundred ninety-four".